ML18051A846

Proposed Tech Specs Adding 480-volt Distribution Buses 19 & 20 to Provide Class IE Power for New HVAC Sys & Future IE Loads

ML18051A846
Person / Time
Site:	Palisades
Issue date:	04/10/1984
From:	CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
Shared Package
ML18051A844	List: ML18051A843 ML18051A845 ML18051A846
References
NUDOCS 8404130239
Download: ML18051A846 (6)

Text

Consumers Power Company Palisades Plant - Docket 50-255 - License DPR-20 PROPOSED TECHNICAL SPECIFICATION CHANGE REQUEST PROPOSED PAGES 5 Pages OC0484-0005A-NL02

3.7 ELECTRICAL SYSTEMS Applicability Applies to the availability of electrical power for the operating of plant components.

Objective To define those conditions of electrical power availability necessary to provide for safe reactor operation and the continuing availability of engineered safety features.

3.7.1 Specifications The primary coolant system shall not be heated or maintained at tempera-tures above 325°F if the following electrical systems are not operable:

a.

Station power tranformer 1-2 (2400 V).

b.

Start-up transformer 1-2 (2400 V).

c.

2400 V engineered safeguards buses lC and lD.

d.

480 V distribution buses 11 and 12.

e.

480 V distribution buses 19 and 20.

f.

MCC numbers 7, 8, 21, 22, 23, and 24.

g.

MCC numbers 1, 2, 25 and 26.

h.

125 V D-C buses DlO and D20.

i. Four preferred AC buses YlO, Y20, Y30 and Y40.

j.

Two station batteries and the d-c systems including at least one battery charger on each bus.

k.

Both diesel generators, with a minimum of 2500 gallons of fuel in each day tank and a minimum of 16,000 gallons of fuel in the underground storage tank.

1.

Switchyard battery and the d-c system with one battery charger.

m.

240 V a-c power panels No. 1 and 2, and their associated ACB breaker distribution systems, which are located in the switchyard.

n.

2400 V bus lE.

3-41 PROPOSED TS0384-0012A-NL02

3.7 ELECTRICAL SYSTEMS (Continued) 3.7.2 The requirements of Specification 3.7.1 may be modified to the extent that one of the following conditions will be allowed after the reactor has been made critical. If any of the provisions of those exceptions are violated, the reactor shall be placed in a hot shutdown condition within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

If the violation is not corrected within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, the reactor shall be placed in a cold shutdown condition within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

a.

Station power transformer 1-2 (2400 V) may be inoperable for up to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> provided the operability of both diesel generators is demonstrated immediately.

b.

Start-up transformers 1-2 (2400 V) may be inoperable for up to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> provided the operability of both diesel generators is demon-strated immediately.

Continued operation beyond 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> is permissible provided that a report is sent to the AEC immediately with an outline of the plans for prompt restoration of the start-up transformer and the additional precautions to be taken while the transformer is out of service, and continue operating until noti-fied differently by the AEC.

c.

2400 V engineered safeguards bus lC or lD may be inoperable for up to 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> provided the operability of the diesel generator asso-ciated with the operable bus is demonstrated immediately and there are not inoperable engineered safety feature componenets associated with the operable bus.

d.

480 V distribution bus 11 or 12 may be inoperable for up to 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> provided there are no inoperable safety feature components asso-ciated with the operable bus.

e.

480 V distribution bus 19 or 20 may be inoperable for up to eight hours provided there are no inoperable safety feature components associated with the operable bus.

f, MCC No. 1 and 25 or 2 and 26 may be inoperable for up to eight hours provided there are no inoperable safety feature components associated with the operable trio of MCC's.

g.

MCC 7, 21 and 23 or 8, 22 and 24may be inoperable for up to 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> provided there are no inoperable safety feature components asso-ciated with the operable MCC.

h.

125 V D-C bus DlO or D20 may be inoperable for up to 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> provided there are no inoperable safety feature components asso-ciated with the operable bus and adequate portable emergency lighting is available during the inoperability of the D20 bus.

i.

One of the four preferred a-c buses may be inoperable for 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> provided the reactor protection and engineered safety feature systems supplied by the remaining three buses are all operable.

3-42 PROPOSED TS0384-0012A-NL02

3.7 ELECTICAL SYSTEMS (Continued)

j. One of the station batteries may be inoperable for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, providing both battery chargers on the affected bus are in opera-tion.

k.

One of the diesel generators may be inoperable for up to 7 days (total for both) during any month, provided the other diesel is started to verify operability, shutdown and the control are left in the automatic mode, and there are no inoperable engineered safety feature components associated with the operable diesel generator.

1.

240 V a-c power panel No. 1 or power panel No. 2 may be inoperable provided that the associated ACB breakers are maintained operable by other means.

If the ACB breakers are not maintained operable, either power panel may be inoperable for up to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> provided that the associated ACB breakers are in the "open" position.

m.

The switchyard battery may be inoperable for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> provided both battery chargers are operable.

n.

The 2400 V bus lE may be inoperable up to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

o.

The switchyard 125 V D-C power panel No. 1 or power panel No. 2 may be inoperable provided the associated ACB breakers are maintained operable by other means.

If the ACB breakers are not maintained operable, either power panel may be inoperable for up to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> provided that the associated ACB breakers are in the "open" posi-tion.

Basis The electrical system equipment is arrranged so that no single con-tingency can inactivate enough safeguards equipment to jeopardize the plant safety.

The 480 V equipment is arranged on four buses.

The 2400 V equipment is supplied from two buses.

The normal source of auxiliary power with the plant at power is from the station power transformers being fed from the main generator with standby power from the start-up tran~f ~rmer and emergency power from either one of two diesel generators.

To supplement the standby power source, a spare 345 kV/22 transformer would be available which, in combination with other mobile transformers, could be connected to take the place of the start-up transformer.* It is estimated that it could take approximately six weeks to mo~~)all of the required equip-ment on site and to place it in service.

There are two emergency power sources on site which do not require outside power or use of the start-up transformer.

Upon loss of normal and standby power sources, the 240 V buses are energized from the diesel generators.

Bus load shedding, transfer to the dies~~)generator and pickup of critical loads are carried out automatically.

When the turbine generator is out of service for an extended period, the generator can be isolated by the removal of links in the bus between the generator and the main transformer, allowing the main 3-43 PROPOSED TS0384-0012A-NL02

3.7 ELECTRICAL SYSTEMS (Continued) transforlfi) and the station power transformers to be returned to service.

The two 4160 V buses et~~ provide power for two primary coolant pumps and a condensate pump.

Operation of the plant could continue if one of these buses were not available as long as power level, etc, were in accordance with Sections 2 and 3.2.3 of these specifications.

The design of the electrical system has been carried out with reliability as a prime consideration.

Station power is provided from three in-dependent sburces.

The outage of any two sources will not cause interruption of service to the station power supply 2400 V or below, down to and including 125 V d-c supply.

Equipment served by auxiliary buses and MCC is arranged so that loss of an entiri 3

~us does not compromise safety of the plant during DBA conditions.

For example, if 2400 V bus ID is lost, two service water pumps, one containment spray, pump and three containment air.

cooler recirculation fans are lost.

This leaves two containment spray pumps, one containment air cooler recirculation fan and one service water pump, which is more than sufficient to control contaillll).ent pressure below the design value during the DBA.

The requirements for MCC No. 1, 2, 7, 8, 21, 22, 23, 24, 25, and 26 and the 480 V distributions buses 11, 12, 19 and 20 will assure availability of safety equipment such as charging pumps, boric acid pumps and safety injection valves.

The 125 V d-c buses No. DlO and No.

D20 are requried for critical instrument and control operations.

The total day tank capacity of 2700 gallons on each diesel is con-sidered more than adequate since approximately 28 hours3.240741e-4 days <br />0.00778 hours <br />4.62963e-5 weeks <br />1.0654e-5 months <br /> running time (worst case loading) is available before transfer to fuel oil from the 30,000-gallon underground storage tank is mandatory.

Two 20-gpm diesel oil transfer pumps with each being fed from a different diesel are available for transferring fuel oil from the storage tank to the day tanks.

In addition, a connection is available outside the diesel rooms to pump oil directly into the day tanks from an oil tanker truck.

The 16,000 gallons in the storage tank in addition to the day tank will provide a diesel operation(~jder required loading conditions for a minimum period of 7 days.

It is considered incredible not to be able to secure fuel oil from one of several sources within a radius of 70 miles in less than three days under the worst of weather conditions.

One battery charger on each battery shall be operating so that the batteries will always be at full charge in anticipation of loss-of-ac power incident.

This insures that adequate d-c power will be available for starting the emergency generators and other emergency uses.

Each battery has two battery chargers available rated at 200 amperes each.

Except for the first minute following a DBA, the capacity of the two battery chargers will handle all required loads.

The second battery continues to be available in the event of a DBA to pitg)up the load from its half of the installed engineered safeguards.

Each of the reactor protective system channels and the engineered safeguards 3-44 PROPOSED TS0384-0012A-NL02

3.7 ELECTRICAL SYSTEMS (Continued) instrumentation channels is supplied by one of the preferred a-c buses.

The removal of one *of the preferred a-c buses is permitted as the 2-of-4 logic can be chang~1)to a 2-of-3 or 1-of-2 logic without com-promising reactor safety.

Reliable switchyard operation requires the availablity of the d-c system in the switchyard for breaker controls and the 240 V a-c system for air compressor operation.

The power and air requirements are small, however, and readily adaptable to temporary hookup to alternate power panels or air comprssors, so continued operation without the time limitations is permitted provided the affected ACB brteakers can be restored to operability through such temporary hookups.

In all such situations, restoration to normal conditions shall be accomplished as soon as practicable.

The 240 V bus lE is required to assure availablity of the pressurizer heaters.

To attain a high degree of reliability for starting and assuming load, the unit will be started to prove operability and shutdown with the controls left in the automatic "start" position.

References (1) FSAR, Section 8.1.2.

(2) FSAR, Amendment No. 14, Question 8.4.

(3) FSAR, Section 8.3.2*

(4) FSAR, Section 8.3.1.

(5) FSAR, Section 8.4.1.

(6) FSAR, Section 8.4.2.

(7) FSAR, Section* 8.3.5.

3-45 PROPOSED TS0384-0012A-NL02